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Mechanisms Contributing to Hydrogen-Influenced Early Failure of Bridge Tendons.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Mechanisms Contributing to Hydrogen-Influenced Early Failure of Bridge Tendons./
作者:	Dukeman, David.
面頁冊數:	1 online resource (154 pages)
附註:	Source: Dissertations Abstracts International, Volume: 85-06, Section: A.
Contained By:	Dissertations Abstracts International85-06A.
標題:	Engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9798381102680

Mechanisms Contributing to Hydrogen-Influenced Early Failure of Bridge Tendons.
Dukeman, David.

Mechanisms Contributing to Hydrogen-Influenced Early Failure of Bridge Tendons. - 1 online resource (154 pages)

Source: Dissertations Abstracts International, Volume: 85-06, Section: A.

Thesis (Ph.D.)--University of South Florida, 2023.

Includes bibliographical references

Failures in post-tensioned tendons have occurred without warning due to fractures in the high-strength steel strands. These strands are cold-drawn to increase their strength while still retaining the preferential ductile mode of fracture. Recently, a tendon failure that occurred in an upper deviation block of the I-526 James B. Edwards bridge crossing the Wando river showed signs of corrosion and potentially another method of failure, hydrogen embrittlement. One proposed source of hydrogen is through galvanic coupling that may exist between the galvanized steel duct and the steel strands. This coupling, if substantial, can promote hydrogen evolution at the steel strand's surface, which may or may not be mitigated by the condition and quality of the grout. Another proposed source of hydrogen is as a partial byproduct from a corrosion reaction that may initiate on the steel strands. Although corrosion is not likely to occur in a properly grouted tendon, voids that naturally occur in segregated grout can result in corrosion. The objectives of this work are to identify sources of hydrogen, determine conditions that promote galvanic coupling, determine conditions that initiate corrosion, quantify the amount of hydrogen produced from galvanic coupling, and quantify the amount of hydrogen produced from corrosion. The results from this work aim to inform design decisions about what factors to consider to minimize hydrogen-induced damage for future post-tensioned bridge construction.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798381102680Subjects--Topical Terms:

561152
Engineering.
Subjects--Index Terms:

CorrosionIndex Terms--Genre/Form:

554714
Electronic books.

Mechanisms Contributing to Hydrogen-Influenced Early Failure of Bridge Tendons.
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520 $a Failures in post-tensioned tendons have occurred without warning due to fractures in the high-strength steel strands. These strands are cold-drawn to increase their strength while still retaining the preferential ductile mode of fracture. Recently, a tendon failure that occurred in an upper deviation block of the I-526 James B. Edwards bridge crossing the Wando river showed signs of corrosion and potentially another method of failure, hydrogen embrittlement. One proposed source of hydrogen is through galvanic coupling that may exist between the galvanized steel duct and the steel strands. This coupling, if substantial, can promote hydrogen evolution at the steel strand's surface, which may or may not be mitigated by the condition and quality of the grout. Another proposed source of hydrogen is as a partial byproduct from a corrosion reaction that may initiate on the steel strands. Although corrosion is not likely to occur in a properly grouted tendon, voids that naturally occur in segregated grout can result in corrosion. The objectives of this work are to identify sources of hydrogen, determine conditions that promote galvanic coupling, determine conditions that initiate corrosion, quantify the amount of hydrogen produced from galvanic coupling, and quantify the amount of hydrogen produced from corrosion. The results from this work aim to inform design decisions about what factors to consider to minimize hydrogen-induced damage for future post-tensioned bridge construction.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
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